Income Taxes - Schedule of Unrecognized Tax Benefits (Details)	12 Months Ended
	Jul. 31, 2018 USD ($)
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance as of July 31, 2017	$ 0
Gross increase for tax positions of prior fiscal years	1,746,000
Gross increase for tax positions of current fiscal year	876,000
Balance as of July 31, 2018	$ 2,622,000